Can you solve these three questions please? 1. Which type of bond joins amino acids into proteins? a. Glycosidic bond b. Hydrogen bond c. Ester bond d. Amide bond

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Can you solve these three questions please?

1. Which type of bond joins amino acids into proteins?

a. Glycosidic bond

b. Hydrogen bond

c. Ester bond

d. Amide bond 

### Understanding Solution Conditions for the Amino Acid Glycine

**Question 11 of 36**

"A form of the amino acid glycine is shown here. What solution conditions must be present based on this structure?"

**Structural Diagram Explanation:**
- The chemical structure shown is of glycine with the following components:
  - A central carbon atom (C) bonded to:
    - An amino group (\( \text{H}_3\text{N}^+ \))
    - A carboxyl group (\( \text{COOH} \))
    - A single hydrogen atom (H)
    - Another carboxyl group with a negative charge (\( \text{COO}^- \))

**Diagram:**
```
H3N+ - CH - COOH
        |
        H
```

**Answer Options:**
A) Acidic  
B) Basic  
C) Neutral  
D) Not possible to tell

### Analysis:
The structure delineated includes both a protonated amino group (\( \text{H}_3\text{N}^+ \)) and a carboxyl group (\( \text{COOH} \)), indicative of an environment where the amino group has gained a proton and the carboxyl group has not lost its proton—characteristic of an acidic solution.

Thus, the correct answer is:
**A) Acidic**
Transcribed Image Text:### Understanding Solution Conditions for the Amino Acid Glycine **Question 11 of 36** "A form of the amino acid glycine is shown here. What solution conditions must be present based on this structure?" **Structural Diagram Explanation:** - The chemical structure shown is of glycine with the following components: - A central carbon atom (C) bonded to: - An amino group (\( \text{H}_3\text{N}^+ \)) - A carboxyl group (\( \text{COOH} \)) - A single hydrogen atom (H) - Another carboxyl group with a negative charge (\( \text{COO}^- \)) **Diagram:** ``` H3N+ - CH - COOH | H ``` **Answer Options:** A) Acidic B) Basic C) Neutral D) Not possible to tell ### Analysis: The structure delineated includes both a protonated amino group (\( \text{H}_3\text{N}^+ \)) and a carboxyl group (\( \text{COOH} \)), indicative of an environment where the amino group has gained a proton and the carboxyl group has not lost its proton—characteristic of an acidic solution. Thus, the correct answer is: **A) Acidic**
**Question 14 of 36**

**Which of the following amino acids have R groups that are polar?**

**Alanine, Tyrosine, Serine**

**Options:**
A) Alanine, Tyrosine, and Serine are all polar
B) Only Alanine and Tyrosine are polar
C) Only Alanine and Serine are polar
D) Only Tyrosine and Serine are polar
E) Only Tyrosine is polar

**Explanation:**
Amino acids can be classified based on the properties of their side chains (R groups). Polar amino acids have side chains that are hydrophilic, meaning they can form hydrogen bonds with water, whereas nonpolar amino acids have hydrophobic side chains. Identifying polar amino acids is important for understanding protein structure and function.

- **Alanine**: Nonpolar (hydrophobic)
- **Tyrosine**: Polar (hydrophilic)
- **Serine**: Polar (hydrophilic)

Hence, the correct answer among the provided options is:

D) Only Tyrosine and Serine are polar
Transcribed Image Text:**Question 14 of 36** **Which of the following amino acids have R groups that are polar?** **Alanine, Tyrosine, Serine** **Options:** A) Alanine, Tyrosine, and Serine are all polar B) Only Alanine and Tyrosine are polar C) Only Alanine and Serine are polar D) Only Tyrosine and Serine are polar E) Only Tyrosine is polar **Explanation:** Amino acids can be classified based on the properties of their side chains (R groups). Polar amino acids have side chains that are hydrophilic, meaning they can form hydrogen bonds with water, whereas nonpolar amino acids have hydrophobic side chains. Identifying polar amino acids is important for understanding protein structure and function. - **Alanine**: Nonpolar (hydrophobic) - **Tyrosine**: Polar (hydrophilic) - **Serine**: Polar (hydrophilic) Hence, the correct answer among the provided options is: D) Only Tyrosine and Serine are polar
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